1. The problem statement, all variables and given/known data A positron moves in a circular path of radius R due to a uniform magnetic field of strength B applied perpendicular to the plane of the circle. If B is varied, which of the following best represents a graph of the kinetic energy of the positron as a function of B so that the positron maintains the same radius R. 2. Relevant equations qvB=mv^2/R 3. The attempt at a solution KE = 1/2MV^2 Rearranging first equation, RqvB =mv^2, then multiply each side by 2 2RqvB = KE Here i thought that KE is proportional to B, but v remains a variable that depends on KE. How do create a relationship between B and KE?